Well, to start, there isn't a Spring 2.6. I assume that you mean 2.5 and 3.0.
There are a *LOT* of new features in Spring 2.5 and 3.0, but the BIGGEST new features are...
Spring 2.5:
- Automatic bean discovery and autowiring (resulting in a lot less XML)
- A new annotation-based Spring MVC web framework that replaces the hold hierarchical controller-based framework.
Spring 3.0:
- Enhancements to Spring MVC to support REST
- A new Spring Expression Language (SpEL) for extremely powerful bean wiring options (among other things)
But there's tons more...those are just the big-ticket items.
That Table of Contents will be changing slightly...but it is fairly representative of what will be in the book. I might be merging a couple of those chapters...and I *might* add a chapter or appendix on Roo before it's done. We'll see.